Well, I think Effendi is a human, he can make mistakes
(Effendi, non me ne volere
)
I don't know what he means with "any amount is available", but the available amounts are listed on TIM website (
http://www.tim.it/home) in the block "Ricarica Online"
To change the SIM owner (given that someone bought a sim for you and provided his documents, and not yours), you'll have to fax TIM with your documents and the buyer's documents, along with a signed (by both of you) document where you state that you'll be the new owner. This process will take about a week. And yes, it is relatively easy to get a nano sim